/**************************************************************************
 *                                                                        *
 * Light OPC Server development library                                   *
 *                                                                        *
 *   Copyright (c) 2000 by Timofei Bondarenko, Kostya Volovich            *
                                                                          *
 Various string functions
 **************************************************************************/

#include <wchar.h>
#define WIN32_LEAN_AND_MEAN /* gcc 3.2 wants it or <wtypes.h> */
#include <objbase.h> /* CoTaskMemAlloc() */
#include "util.h"

void *lo_string_to_struct(void *allocated, unsigned strusize, const loWchar *str)
{
 unsigned string;
 void *newptr;

 if (!str) str = L"";
 string = (wcslen(str) + 1) * sizeof(wchar_t);

 if (newptr = reallocX(allocated, strusize + string))
   {
    if (allocated == (void*)str) str = (loWchar*)newptr;
    memmove((char*)newptr + strusize, str, string);
    memset(newptr, 0, strusize);
   }
 return newptr;
}

void *preallocX(void **buf, unsigned size)
{
 void *nbuf;
 if (!buf) return 0;
 if (!size)
   {
    if (*buf) freeX(*buf);
    return *buf = 0;
   }
 if (nbuf = reallocX(*buf, size)) *buf = nbuf;
 return nbuf;
}

const loWchar *loWnul(const loWchar *str) { return str? str: L"<null>"; }
const char *loSnul(const char *str) { return str? str: "<null>"; }

static const unsigned short crcCCITT[256] =
{
	0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50A5, 0x60C6, 0x70E7,
	0x8108, 0x9129, 0xA14A, 0xB16B, 0xC18C, 0xD1AD, 0xE1CE, 0xF1EF,
	0x1231, 0x0210, 0x3273, 0x2252, 0x52B5, 0x4294, 0x72F7, 0x62D6,
	0x9339, 0x8318, 0xB37B, 0xA35A, 0xD3BD, 0xC39C, 0xF3FF, 0xE3DE,
	0x2462, 0x3443, 0x0420, 0x1401, 0x64E6, 0x74C7, 0x44A4, 0x5485,
	0xA56A, 0xB54B, 0x8528, 0x9509, 0xE5EE, 0xF5CF, 0xC5AC, 0xD58D,
	0x3653, 0x2672, 0x1611, 0x0630, 0x76D7, 0x66F6, 0x5695, 0x46B4,
	0xB75B, 0xA77A, 0x9719, 0x8738, 0xF7DF, 0xE7FE, 0xD79D, 0xC7BC,
	0x48C4, 0x58E5, 0x6886, 0x78A7, 0x0840, 0x1861, 0x2802, 0x3823,
	0xC9CC, 0xD9ED, 0xE98E, 0xF9AF, 0x8948, 0x9969, 0xA90A, 0xB92B,
	0x5AF5, 0x4AD4, 0x7AB7, 0x6A96, 0x1A71, 0x0A50, 0x3A33, 0x2A12,
	0xDBFD, 0xCBDC, 0xFBBF, 0xEB9E, 0x9B79, 0x8B58, 0xBB3B, 0xAB1A,
	0x6CA6, 0x7C87, 0x4CE4, 0x5CC5, 0x2C22, 0x3C03, 0x0C60, 0x1C41,
	0xEDAE, 0xFD8F, 0xCDEC, 0xDDCD, 0xAD2A, 0xBD0B, 0x8D68, 0x9D49,
	0x7E97, 0x6EB6, 0x5ED5, 0x4EF4, 0x3E13, 0x2E32, 0x1E51, 0x0E70,
	0xFF9F, 0xEFBE, 0xDFDD, 0xCFFC, 0xBF1B, 0xAF3A, 0x9F59, 0x8F78,
	0x9188, 0x81A9, 0xB1CA, 0xA1EB, 0xD10C, 0xC12D, 0xF14E, 0xE16F,
	0x1080, 0x00A1, 0x30C2, 0x20E3, 0x5004, 0x4025, 0x7046, 0x6067,
	0x83B9, 0x9398, 0xA3FB, 0xB3DA, 0xC33D, 0xD31C, 0xE37F, 0xF35E,
	0x02B1, 0x1290, 0x22F3, 0x32D2, 0x4235, 0x5214, 0x6277, 0x7256,
	0xB5EA, 0xA5CB, 0x95A8, 0x8589, 0xF56E, 0xE54F, 0xD52C, 0xC50D,
	0x34E2, 0x24C3, 0x14A0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
	0xA7DB, 0xB7FA, 0x8799, 0x97B8, 0xE75F, 0xF77E, 0xC71D, 0xD73C,
	0x26D3, 0x36F2, 0x0691, 0x16B0, 0x6657, 0x7676, 0x4615, 0x5634,
	0xD94C, 0xC96D, 0xF90E, 0xE92F, 0x99C8, 0x89E9, 0xB98A, 0xA9AB,
	0x5844, 0x4865, 0x7806, 0x6827, 0x18C0, 0x08E1, 0x3882, 0x28A3,
	0xCB7D, 0xDB5C, 0xEB3F, 0xFB1E, 0x8BF9, 0x9BD8, 0xABBB, 0xBB9A,
	0x4A75, 0x5A54, 0x6A37, 0x7A16, 0x0AF1, 0x1AD0, 0x2AB3, 0x3A92,
	0xFD2E, 0xED0F, 0xDD6C, 0xCD4D, 0xBDAA, 0xAD8B, 0x9DE8, 0x8DC9,
	0x7C26, 0x6C07, 0x5C64, 0x4C45, 0x3CA2, 0x2C83, 0x1CE0, 0x0CC1,
	0xEF1F, 0xFF3E, 0xCF5D, 0xDF7C, 0xAF9B, 0xBFBA, 0x8FD9, 0x9FF8,
	0x6E17, 0x7E36, 0x4E55, 0x5E74, 0x2E93, 0x3EB2, 0x0ED1, 0x1EF0
};

int lo_wcshash(const loWchar *ws)
{
 int acc = 0;
 if (ws)
   {
    int wc, shift = 0;
    while(wc = *ws++)
      {
#if 1
	   acc = (acc << 8) ^ crcCCITT[((acc >> 8) ^ wc) & 0xff];
#elif 1
       acc ^= wc << shift;
       shift = 0x0f & (shift + 7 + wc + acc);
#else
       acc ^= wc << shift;
       shift = 0x0f & (shift + 7);
#endif
      }
   }
 return acc;
}

int lo_wcsihash(const loWchar *ws)
{
 int acc = 0;

 if (ws)
   {
    loWchar tbu[32+1];
    size_t plen = SIZEOF_ARRAY(tbu) - 1,
           nlen = wcslen(ws);
    tbu[plen] = 0;
    do {
        if (nlen < plen) tbu[plen = nlen] = 0;
        memcpy(tbu, ws, plen * sizeof(loWchar)); ws += plen;
#if 1
        _wcslwr(tbu);
#else
        CharLowerW(tbu);
#endif
        acc ^= lo_wcshash(tbu); /* OK, it's not a CRC */
       }
    while(nlen -= plen);
   }
 return acc;
}

#if 0
int lo_wcsnhash(const loWchar *ws, unsigned len)
{
 int acc = 0;
 if (ws)
   {
    int shift = 0, wc;
    while((wc = *ws++) && len--)
      {
       acc ^= wc << shift;
       shift = 0x0f & (shift + 7 + wc + acc);
      }
   }
 return acc;
}

int lo_wcsnihash(const loWchar *ws, unsigned len)
{
 int acc = 0;

 if (ws)
   {
    int shift = 0;
    wint_t wc;
    while((wc = *ws++) && len--)
      {
#if 1
       wc = towlower(wc);
#else
       CharLowerW(tbu);
#endif
       acc ^= wc << shift;
       shift = 0x0f & (shift + 7 + wc + acc);
      }
   }
 return acc;
}
#endif

loWchar *loMWstrdup(const char *str)
{
 loWchar *ns;
 unsigned len;

 if (!str) return 0;
 len = strlen(str) + 1;
 len = lo_mbstowcs(0, str, len); /* lo_mbstowcs() never returns -1 */
 ns = (loWchar*)mallocX((len + 1) * sizeof(loWchar));
 if (ns)
   {
    lo_mbstowcs(ns, str, len);
    ns[len] = 0;
   }
 return ns;
}

loWchar *loWstrdup(const loWchar *str)
{
 loWchar *ns;
 unsigned len;

 if (!str) return 0; /* ?? str = L"" */
 ns = (loWchar*)mallocX(len = (wcslen(str) + 1) * sizeof(loWchar));
 if (ns) memcpy(ns, str, len);
 return ns;
}

loWchar *loWstrndup(const loWchar *str, unsigned len)
{
 loWchar *ns;

 ns = (loWchar*)mallocX((len + 1) * sizeof(loWchar));
 if (ns)
   {
    if (str) wcsncpy(ns, str, len), ns[len] = 0;
    else memset(ns, 0, (len + 1) * sizeof(loWchar));
   }
 return ns;
}

int loPWstrdup(loWchar **ps, const loWchar *str)
{
 loWchar *sstr;
 if (str)
   {
    if (!(sstr = loWstrdup(str))) return -1;
   }
 else sstr = 0;
 if (*ps) freeX(*ps);
 *ps = sstr;
 return 0;
}

loWchar *loComWstrdup(const loWchar *str)
{
 loWchar *ns;
 unsigned len;

 if (!str) return 0; /* ?? str = L"" */
 ns = (loWchar*)loComAlloc(len = (wcslen(str) + 1) * sizeof(loWchar));
 if (ns) memcpy(ns, str, len);
 return ns;
}

loWchar *loComWstrndup(const loWchar *str, unsigned len)
{
 loWchar *ns;

 if (!str) return 0; /* ?? str = L"" */
 ns = (loWchar*)loComAlloc((len + 1) * sizeof(loWchar));
 if (ns) wcsncpy(ns, str, len), ns[len] = 0;
 return ns;
}

loWchar *loComMWstrdup(const char *str)
{
 loWchar *ns;
 unsigned len;

 if (!str) return 0;
 len = strlen(str) + 1;
 len = lo_mbstowcs(0, str, len); /* lo_mbstowcs() never returns -1 */
 ns = (loWchar*)loComAlloc((len + 1) * sizeof(loWchar));
 if (ns)
   {
     lo_mbstowcs(ns, str, len);
     ns[len] = 0;
   }
 return ns;
}

void loComFree_LPWSTR(LPWSTR *ws, unsigned count)
{
 while(count--)
   if (ws[count]) loComFree(ws[count]);
 loComFree(ws);
}

/* end of strutil.c */
